difference between numbers using or without using variable

Question

What\'s the difference between the following code?

var a = 1;
a.toString(); // outputs: \"1\"

But this throws an error:

1.t         


        

Answer 1

The toString() method returns a string representing object.

So when you call:

a.toString();

You are actually operating on an object. You are actually creating a built-in object when you define a variable(in this case it is a number).

When you do this:

1.toString();

toString() doesn't see 1 as an object or a variable(both are the same in this scenario) because it fails the rule:

Variable must begin with a letter

Here 1 doesn't begin with a letter. So toString() knows it is not operating on an object and throws an error.